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Official site of the design, build, test and launch of JWST.


JWST Science overview, future home of science data and images.


Overview of the spacecraft, mission and science of JWST.

JWST related content on the NASA HOME PAGE plus links to NASA’s other great activities and missions.


JWST related Missions.


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The science instruments are the heart of the James Webb Space Telescope. The four science instruments will be contained within the Integrated Science Instrument Module or ISIM. This unit will house the four main instruments that will detect light from distant stars and galaxies, and planets orbiting other stars.

The ISIM structure (pictured below) is like a chassis in a car providing support for the engine and other components.

Integrated Science Instrument Module (ISIM) Structure

The ISIM includes the following instruments:

Instruments integrated in ISIM Structure

All four flight science instruments were integrated into the ISIM structure by March 2014.

JWST Team Photo with Completed Flight Instrument module

Many different smaller parts go into the whole ISIM structure. These include the ISIM Structure Subsystem; ISIM Thermal Control Subsystem; ISIM Control and Data Handling Subsystem; ISIM Flight Software; and ISIM Harness Assemblies.

ISIM Components within the Observatory
Image Gallery View our image gallery for pictures of the ISIM and instruments.
Web cam Watch our NASA Goddard cleanroom Webb-cam live!